See the file 'INSTALL'
+Release notes for 2.16
+======================
+
+* Password entries now display a caps-lock warning. This can be turned off
+ with the caps-lock-warning property.
+
+* Various orientation-related functions have been deprecated in favour
+ of the new GtkOrientable interface: gtk_scale_button_get_orientation,
+ gtk_scale_button_set_orientation, gtk_toolbar_set_orientation.
+
+* The action-proxy interaction has been changed. Widgets that operate as
+ proxies have to implement the GtkActivatable interface now. GtkActivatable
+ implementation are responsible for syncing their appearance with the
+ action and for activating the action. All GTK+ widgets that are commonly
+ used as proxies implement the GtkActivatable interface.
+
+* The handling of keyboard shortcuts has been changed, to help with a
+ longstanding complaint about the way GTK+ handles multiple layouts. GTK+
+ now only uses keys from groups other than the current group if they are
+ not present in the current group.
+
Release notes for 2.14
======================
the GtkFileSystem interface is no longer available, nor the filechooser
will load any GtkFileSystem implementation.
+* GtkComboBox now renders the popdown button insensitive when
+ the model is empty. Applications which want to populate the list
+ only before displaying it can set gtk_combo_box_set_button_sensitivity
+ to GTK_SENSITIVITY_ON, so that the button is always sensitive or
+ GTK_SENSITIVITY_OFF to make it insensitive respectively.
+
+* In the early 2.14.x releases, GtkAdjustment was changed to enforce
+ that values are restricted to the range [lower, upper - page_size].
+ This has always been the documented behaviour, and the recommended
+ practice is to set page_size to 0 when using adjustments for simple
+ scalar values, like in a slider or spin button.
+ Due to the large number of applications that are affected by this
+ change, the behaviour has been reverted to the old behaviour in
+ 2.14.3, with an explicit warning that this change will be
+ reintroduced in 2.90.
+
+* gdk-pixbuf will use GIO for mime type detection if possible. For
+ this to work, shared-mime-info needs to be installed and XDG_DATA_DIRS
+ set accordingly at configure time. Otherwise, gdk-pixbuf falls
+ back to its built-in sniffing implementation.
+
Release notes for 2.12
======================